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 #include &quot;certificateinfo.h&quot;
 #include &quot;sslclient.h&quot;
 #include &quot;ui_sslclient.h&quot;
 #include &quot;ui_sslerrors.h&quot;

 #include &lt;QtGui/QScrollBar&gt;
 #include &lt;QtGui/QStyle&gt;
 #include &lt;QtGui/QToolButton&gt;
 #include &lt;QtNetwork/QSslCipher&gt;

 SslClient::SslClient(QWidget *parent)
     : QWidget(parent), socket(0), padLock(0)
 {
     form = new Ui_Form;
     form-&gt;setupUi(this);
     form-&gt;hostNameEdit-&gt;setSelection(0, form-&gt;hostNameEdit-&gt;text().size());
     form-&gt;sessionOutput-&gt;setHtml(tr(&quot;&amp;lt;not connected&amp;gt;&quot;));

     connect(form-&gt;hostNameEdit, SIGNAL(textChanged(QString)),
             this, SLOT(updateEnabledState()));
     connect(form-&gt;connectButton, SIGNAL(clicked()),
             this, SLOT(secureConnect()));
     connect(form-&gt;sendButton, SIGNAL(clicked()),
             this, SLOT(sendData()));
 }

 SslClient::~SslClient()
 {
     delete form;
 }

 void SslClient::updateEnabledState()
 {
     bool unconnected = !socket || socket-&gt;state() == QAbstractSocket::UnconnectedState;

     form-&gt;hostNameEdit-&gt;setReadOnly(!unconnected);
     form-&gt;hostNameEdit-&gt;setFocusPolicy(unconnected ? Qt::StrongFocus : Qt::NoFocus);

     form-&gt;hostNameLabel-&gt;setEnabled(unconnected);
     form-&gt;portBox-&gt;setEnabled(unconnected);
     form-&gt;portLabel-&gt;setEnabled(unconnected);
     form-&gt;connectButton-&gt;setEnabled(unconnected &amp;&amp; !form-&gt;hostNameEdit-&gt;text().isEmpty());

     bool connected = socket &amp;&amp; socket-&gt;state() == QAbstractSocket::ConnectedState;
     form-&gt;sessionBox-&gt;setEnabled(connected);
     form-&gt;sessionOutput-&gt;setEnabled(connected);
     form-&gt;sessionInput-&gt;setEnabled(connected);
     form-&gt;sessionInputLabel-&gt;setEnabled(connected);
     form-&gt;sendButton-&gt;setEnabled(connected);
 }

 void SslClient::secureConnect()
 {
     if (!socket) {
         socket = new QSslSocket(this);
         connect(socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
                 this, SLOT(socketStateChanged(QAbstractSocket::SocketState)));
         connect(socket, SIGNAL(encrypted()),
                 this, SLOT(socketEncrypted()));
         connect(socket, SIGNAL(sslErrors(QList&lt;QSslError&gt;)),
                 this, SLOT(sslErrors(QList&lt;QSslError&gt;)));
         connect(socket, SIGNAL(readyRead()),
                 this, SLOT(socketReadyRead()));
     }

     socket-&gt;connectToHostEncrypted(form-&gt;hostNameEdit-&gt;text(), form-&gt;portBox-&gt;value());
     updateEnabledState();
 }

 void SslClient::socketStateChanged(QAbstractSocket::SocketState state)
 {
     updateEnabledState();
     if (state == QAbstractSocket::UnconnectedState) {
         form-&gt;hostNameEdit-&gt;setPalette(QPalette());
         form-&gt;hostNameEdit-&gt;setFocus();
         form-&gt;cipherLabel-&gt;setText(tr(&quot;&lt;none&gt;&quot;));
         if (padLock)
             padLock-&gt;hide();
         socket-&gt;deleteLater();
         socket = 0;
     }
 }

 void SslClient::socketEncrypted()
 {
     form-&gt;sessionOutput-&gt;clear();
     form-&gt;sessionInput-&gt;setFocus();

     QPalette palette;
     palette.setColor(QPalette::Base, QColor(255, 255, 192));
     form-&gt;hostNameEdit-&gt;setPalette(palette);

     QSslCipher ciph = socket-&gt;sessionCipher();
     QString cipher = QString(&quot;%1, %2 (%3/%4)&quot;).arg(ciph.authenticationMethod())
                      .arg(ciph.name()).arg(ciph.usedBits()).arg(ciph.supportedBits());;
     form-&gt;cipherLabel-&gt;setText(cipher);

     if (!padLock) {
         padLock = new QToolButton;
         padLock-&gt;setIcon(QIcon(&quot;:/encrypted.png&quot;));
         padLock-&gt;setCursor(Qt::ArrowCursor);
         padLock-&gt;setToolTip(tr(&quot;Display encryption details.&quot;));

         int extent = form-&gt;hostNameEdit-&gt;height() - 2;
         padLock-&gt;resize(extent, extent);
         padLock-&gt;setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Ignored);

         QHBoxLayout *layout = new QHBoxLayout(form-&gt;hostNameEdit);
         layout-&gt;setMargin(form-&gt;hostNameEdit-&gt;style()-&gt;pixelMetric(QStyle::PM_DefaultFrameWidth));
         layout-&gt;setSpacing(0);
         layout-&gt;addStretch();
         layout-&gt;addWidget(padLock);

         form-&gt;hostNameEdit-&gt;setLayout(layout);

         connect(padLock, SIGNAL(clicked()),
                 this, SLOT(displayCertificateInfo()));
     } else {
         padLock-&gt;show();
     }
 }

 void SslClient::socketReadyRead()
 {
     appendString(QString::fromUtf8(socket-&gt;readAll()));
 }

 void SslClient::sendData()
 {
     QString input = form-&gt;sessionInput-&gt;text();
     appendString(input + &quot;\n&quot;);
     socket-&gt;write(input.toUtf8() + &quot;\r\n&quot;);
     form-&gt;sessionInput-&gt;clear();
 }

 void SslClient::sslErrors(const QList&lt;QSslError&gt; &amp;errors)
 {
     QDialog errorDialog(this);
     Ui_SslErrors ui;
     ui.setupUi(&amp;errorDialog);
     connect(ui.certificateChainButton, SIGNAL(clicked()),
             this, SLOT(displayCertificateInfo()));

     foreach (const QSslError &amp;error, errors)
         ui.sslErrorList-&gt;addItem(error.errorString());

     if (errorDialog.exec() == QDialog::Accepted)
         socket-&gt;ignoreSslErrors();
 }

 void SslClient::displayCertificateInfo()
 {
     CertificateInfo *info = new CertificateInfo(this);
     info-&gt;setCertificateChain(socket-&gt;peerCertificateChain());
     info-&gt;exec();
     info-&gt;deleteLater();
 }

 void SslClient::appendString(const QString &amp;line)
 {
     QTextCursor cursor(form-&gt;sessionOutput-&gt;textCursor());
     cursor.movePosition(QTextCursor::End);
     cursor.insertText(line);
     form-&gt;sessionOutput-&gt;verticalScrollBar()-&gt;setValue(form-&gt;sessionOutput-&gt;verticalScrollBar()-&gt;maximum());
 }</pre>
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